/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.db.engine.compaction.cross.utils;

import org.apache.iotdb.tsfile.file.header.PageHeader;
import org.apache.iotdb.tsfile.read.common.block.TsBlock;
import org.apache.iotdb.tsfile.read.reader.IChunkReader;
import org.apache.iotdb.tsfile.read.reader.chunk.AlignedChunkReader;
import org.apache.iotdb.tsfile.read.reader.chunk.ChunkReader;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.List;

public class PageElement {

    public PageHeader pageHeader;

    public List<PageHeader> valuePageHeaders;

    public TsBlock batchData;

    // compressed page data
    public ByteBuffer pageData;

    public List<ByteBuffer> valuePageDatas;

    public IChunkReader iChunkReader;

    public long priority;

    public long startTime;

    public boolean isSelected = false;

    public boolean isLastPage;

    public ChunkMetadataElement chunkMetadataElement;

    public PageElement(
            PageHeader pageHeader,
            ByteBuffer pageData,
            ChunkReader chunkReader,
            ChunkMetadataElement chunkMetadataElement,
            boolean isLastPage,
            long priority) {
        this.pageHeader = pageHeader;
        this.pageData = pageData;
        this.priority = priority;
        this.iChunkReader = chunkReader;
        this.startTime = pageHeader.getStartTime();
        this.chunkMetadataElement = chunkMetadataElement;
        this.isLastPage = isLastPage;
    }

    public PageElement(
            PageHeader timePageHeader,
            List<PageHeader> valuePageHeaders,
            ByteBuffer timePageData,
            List<ByteBuffer> valuePageDatas,
            AlignedChunkReader alignedChunkReader,
            ChunkMetadataElement chunkMetadataElement,
            boolean isLastPage,
            long priority) {
        this.pageHeader = timePageHeader;
        this.valuePageHeaders = valuePageHeaders;
        this.pageData = timePageData;
        this.valuePageDatas = valuePageDatas;
        this.priority = priority;
        this.iChunkReader = alignedChunkReader;
        this.startTime = pageHeader.getStartTime();
        this.chunkMetadataElement = chunkMetadataElement;
        this.isLastPage = isLastPage;
    }

    public void deserializePage() throws IOException {
        if (iChunkReader instanceof AlignedChunkReader) {
            this.batchData =
                    ((AlignedChunkReader) iChunkReader)
                            .readPageData(pageHeader, valuePageHeaders, pageData, valuePageDatas);
        } else {
            this.batchData = ((ChunkReader) iChunkReader).readPageData(pageHeader, pageData);
        }
    }
}
